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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636051b766757456e93ebbc2f5c1abaf77b3a4e6e221b74b6d8d0fa960a30ced' 
  AND token = '4uI4CPu76qAWkrwXsTHO3/qBb4sEBW1P7Yjt0mSi8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}